Fire Life Safety Analysis of Train Fire in an Underpass

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Presented here is the fire life safety analysis performed by Hatch Mott MacDonald, Los Angeles, for a customer project. The behavior of smoke from a stalled train fire in the underpass is investigated. Using CD-adpaco™'s CFD software STAR-CCM+®, transient 3D Computational Fluid Dynamics techniques have been adopted to analyze smoke movement to quantify the performance of the underpass in terms of providing a tenable environment for escaping passengers under emergency fire conditions. The CFD analysis has also been coupled with an egress analysis to demonstrate whether or not passengers can reach a point of safety within a tenable environment. The results of the analysis demonstrate that under external ‘no-wind’ conditions, with the inclusion of side openings, the environment within the 17.75 feet underpass is tenable. When the height of the underpass is reduced to 16.75 feet, the condition deteriorates slightly, but is still tenable. Therefore, mitigation measures such as further increase in the height of the underpass and mechanical ventilation are not required.

Author Name: 
Sai Doddi